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Out of k, a, n, d and Sn, determine the ...

Out of k, a, n, d and `S_n`, determine the ones that are missing from the following :
l=8,n=8, `S_8 = -20`.

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
  1. Find the sum of indicated number of terms of the following A.P.’s : ...

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  2. Find the sum of indicated number of terms of the following A.P.’s : ...

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  3. Out of k, a, n, d and Sn, determine the ones that are missing from the...

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  4. Out of l, a, n, d and Sn, determine the ones that are missing from the...

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  5. How many terms of the sequence 18, 16, 14.... should be taken so that ...

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  6. How many terms of the sequence -12,-9, -6, -3, ..... must be taken to ...

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  7. How many terms of the sequence -6,(-11)/2, -5,.... must be taken to ma...

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  8. Find the sum of the series : 72 + 70 + 68 +....+ 40?

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  9. Find the sum of first n natural numbers.

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  10. Find the sum of first 100 natural numbers.

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  11. Find the sum to n terms of the A.P. whose kth term is 5k + 1.

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  12. If the sum of n terms of an A.P. is (pn+qn^2), where p and g are const...

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  13. If the sum of a certain number of terms of the A.P. 25, 22, 19, .. . i...

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  14. Find the sum of 32 terms of an A.P. whose third term is 1 and the 6th ...

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  15. If the first term of an A.P. is 2 and the sum of the first five terms ...

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  16. If the first term of an A.P. is 2 and the sum of the first five terms ...

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  17. If the 12th term of an A.P. is -13 and the sum of the first four terms...

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  18. Show that the sum of n consecutive odd integers beginning with 1 equal...

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  19. Show that the sum of first n even numbers is equal to (1+1/n) times th...

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  20. Find the sum of odd integers from 1 to 2001. (A) 100200 (B) 1002001 (C...

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